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The sentence in question:

> 道の外側に出ちゃいけません！

While it is obvious what it means, I am wondering how precisely it is
constructed grammatically.

The textbook way of expressing "must not do" using いけない is:

[て-Form] は いけない

So going by that I would construct it as follows:

出る → 出ちゃう → 出ちゃって → 出ちゃってはいけません

So I assume 「出ちゃいけません」 is simply a shortened form of this grammar.

Is that correct?

If yes, is this common?

If no, how is 「出ちゃいけません」 made up grammatically?


CC BY-SA 4.0
2020-11-27T17:08:53.957
82828
2020-11-27T18:27:23.913
question
grammar verbs casual
Is 「出ちゃいけません」 short for 「出ちゃってはいけません」?


No, short for 出ちゃってはいけません would be 出ちゃっちゃいけません. ～ては itself contracts to ～ちゃ
(compare ではない and じゃない), so 出ちゃいけません is a contracted form of 出てはいけません. This
kind of contraction is extremely common.


CC BY-SA 4.0
2020-11-27T18:27:23.913
82830
2020-11-27T18:27:23.913
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answer